# Movable Type (r) Open Source (C) 2001-2010 Six Apart, Ltd.
# This program is distributed under the terms of the
# GNU General Public License, version 2.
#
# $Id: Blog.pm 4532 2009-10-02 02:25:27Z fumiakiy $

package MT::Blog;

use strict;
use base qw( MT::Object );

use MT::FileMgr;
use MT::Util;

__PACKAGE__->install_properties({
    column_defs => {
        'id' => 'integer not null auto_increment',
        'parent_id' => 'integer',
        'theme_id' => 'string(255)',
        'name' => 'string(255) not null',
        'description' => 'text',
        'archive_type' => 'string(255)',
        'archive_type_preferred' => 'string(25)',
        'site_path' => 'string(255)',
        'site_url' => 'string(255)',
        'days_on_index' => 'integer',
        'entries_on_index' => 'integer',
        'file_extension' => 'string(10)',
        'email_new_comments' => 'boolean',
        'allow_comment_html' => 'boolean',
        'autolink_urls' => 'boolean',
        'sort_order_posts' => 'string(8)',
        'sort_order_comments' => 'string(8)',
        'allow_comments_default' => 'boolean',
        'server_offset' => 'float',
        'convert_paras' => 'string(30)',
        'convert_paras_comments' => 'string(30)',
        'allow_pings_default' => 'boolean',
        'status_default' => 'smallint',
        'allow_anon_comments' => 'boolean',
        'words_in_excerpt' => 'smallint',
        'moderate_unreg_comments' => 'boolean',
        'moderate_pings' => 'boolean',
        'allow_unreg_comments' => 'boolean',
        'allow_reg_comments' => 'boolean',
        'allow_pings' => 'boolean',
        'manual_approve_commenters' => 'boolean',
        'require_comment_emails' => 'boolean',
        'junk_folder_expiry' => 'integer',
        'ping_weblogs' => 'boolean',
        'mt_update_key' => 'string(30)',
        'language' => 'string(5)',
        'welcome_msg' => 'text',
        'google_api_key' => 'string(32)',
        'email_new_pings' => 'boolean',
        'ping_blogs' => 'boolean',
        'ping_technorati' => 'boolean',
        'ping_google' => 'boolean',
        'ping_others' => 'text',
        'autodiscover_links' => 'boolean',
        'sanitize_spec' => 'string(255)',
        'cc_license' => 'string(255)',
        'is_dynamic' => 'boolean',
        'remote_auth_token' => 'string(50)',
        'children_modified_on' => 'datetime',
        'custom_dynamic_templates' => 'string(25)',
        'junk_score_threshold' => 'float',
        'internal_autodiscovery' => 'boolean',
        'basename_limit' => 'smallint',
        'use_comment_confirmation' => 'boolean',
        'allow_commenter_regist' => 'boolean',
        'use_revision' => 'boolean',
        ## Have to keep these around for use in mt-upgrade.cgi.
        'archive_url' => 'string(255)',
        'archive_path' => 'string(255)',
        'old_style_archive_links' => 'boolean',
        'archive_tmpl_daily' => 'string(255)',
        'archive_tmpl_weekly' => 'string(255)',
        'archive_tmpl_monthly' => 'string(255)',
        'archive_tmpl_category' => 'string(255)',
        'archive_tmpl_individual' => 'string(255)',

        # meta properties
        'image_default_wrap_text' => 'integer meta',
        'image_default_align' => 'string meta',
        'image_default_thumb' => 'integer meta',
        'image_default_width' => 'integer meta',
        'image_default_wunits' => 'string meta',
        'image_default_constrain' => 'integer meta',
        'image_default_popup' => 'integer meta',
        'commenter_authenticators' => 'string meta',
        'require_typekey_emails' => 'integer meta',
        'nofollow_urls' => 'integer meta',
        'follow_auth_links' => 'integer meta',
        'update_pings' => 'string meta',
        'captcha_provider' => 'string meta',
        'publish_queue' => 'integer meta',
        'nwc_smart_replace' => 'integer meta',
        'nwc_replace_field' => 'string meta',
        'template_set' => 'string meta',
        'page_layout' => 'string meta',
        'include_system' => 'string meta',
        'include_cache' => 'integer meta',
        'max_revisions_entry' => 'integer meta',
        'max_revisions_template' => 'integer meta',
        'theme_export_settings' => 'hash meta',
    },
    meta => 1,
    audit => 1,
    indexes => {
        name => 1,
        parent_id => 1,
    },
    defaults => {
        'custom_dynamic_templates' => 'none',
    },
    child_classes => ['MT::Entry', 'MT::Page', 'MT::Template', 'MT::Asset',
                      'MT::Category', 'MT::Folder', 'MT::Notification', 'MT::Log',
                      'MT::ObjectTag', 'MT::Association', 'MT::Comment',
                      'MT::TBPing', 'MT::Trackback', 'MT::TemplateMap',
                      'MT::Touch',],
    datasource => 'blog',
    primary_key => 'id',
    class_type => 'blog',
});

# Image upload defaults.
sub ALIGN () { 'none' }
sub UNITS () { 'pixels' }

sub class_label {
    MT->translate("Blog");
}

sub class_label_plural {
    MT->translate("Blogs");
}

{
my $default_text_format;
sub set_defaults {
    my $blog = shift;
    $blog->SUPER::set_defaults(@_);

    unless ($default_text_format) {
        if (my $allowed = MT->config('AllowedTextFilters')) {
            $allowed =~ s/\s*,.*//;
            $default_text_format = $allowed; # choose first allowed format
        } else {
            $default_text_format = 'richtext'; # MT system default
        }
        my $filters = MT->registry("text_filters");
        # If the 'richtext' filter exists,
        # and is uncondition or it meets the condition, use
        # it as the blog default text format.
        if (!($filters->{$default_text_format} && (!$filters->{$default_text_format}{condition} || $filters->{$default_text_format}{condition}->('blog')))) {
            $default_text_format = '__default__';
        }
    }
    $blog->set_values_internal({
        days_on_index => 0,
        entries_on_index => 10,
        words_in_excerpt => 40,
        sort_order_posts => 'descend',
        language => MT->config('DefaultLanguage'),
        sort_order_comments => 'ascend',
        file_extension => 'html',
        convert_paras => $default_text_format,
        allow_unreg_comments => 0,
        allow_reg_comments => 1,
        allow_pings => 1,
        moderate_unreg_comments => MT::Blog::MODERATE_UNTRSTD(),
        moderate_pings => 1,
        require_comment_emails => 1,
        allow_comments_default => 1,
        allow_comment_html => 1,
        autolink_urls => 1, 
        allow_pings_default => 1,
        require_comment_emails => 0,
        convert_paras_comments => 1,
        email_new_pings => 1,
        email_new_comments => 1,
        allow_commenter_regist => 1,
        use_comment_confirmation => 1,
        sanitize_spec => 0,
        ping_weblogs => 0,
        ping_blogs => 0,
        ping_technorati => 0,
        ping_google => 0,
        archive_type => '',
        archive_type_preferred => '',
        status_default => 2,
        junk_score_threshold => 0,
        junk_folder_expiry => 14, # 14 days
        custom_dynamic_templates => 'none',
        internal_autodiscovery => 0,
        basename_limit => 100,
        server_offset => MT->config('DefaultTimezone') || 0,
        # something far in the future to force dynamic side to read it.
        children_modified_on => '20101231120000',
        use_revision => 1,
    });
    return $blog;
}
}

sub is_blog {
    my $class = shift;
    return $class->class eq 'blog';
}

sub create_default_blog {
    my $class = shift;
    my ($blog_name, $blog_template, $website_id) = @_;
    $blog_name ||= MT->translate("First Blog");
    $class = ref $class if ref $class;

    my $blog = new $class;
    $blog->name($blog_name);

    # Enable nofollow options
    $blog->nofollow_urls(1);
    $blog->follow_auth_links(1);

    # Enable default commenter authentication
    $blog->commenter_authenticators(MT->config('DefaultCommenterAuth'));

    # set default page layout
    $blog->page_layout('layout-wtt');

    # Set class type
    $blog->class('blog');

    # Set parent
    $blog->parent_id($website_id);

    $blog->save or return $class->error($blog->errstr);
    $blog->create_default_templates($blog_template || 'mt_blog')
        or return $class->error($blog->errstr);
    return $blog;
}

sub create_default_templates {
    my $blog = shift;

    my $app = MT->instance;
    my $curr_lang = $app->current_language;
    $app->set_language($blog->language);

    require MT::DefaultTemplates;
    my $tmpl_list = MT::DefaultTemplates->templates( @_ );
    if ( !$tmpl_list || (ref($tmpl_list) ne 'ARRAY') || (!@$tmpl_list) ) {
        $app->set_language($curr_lang);
        return $blog->error(MT->translate("No default templates were found."));
    }

    require MT::Template;
    my @arch_tmpl;
    for my $val (@$tmpl_list) {
        next if $val->{global};

        my $obj = MT::Template->new;
        my $p = $val->{plugin} || 'MT'; # component and/or MT package for translate
        local $val->{name} = $val->{name}; # name field is translated in "templates" call
        my $text = $val->{text};
        local $val->{text};
        $val->{text} = $p->translate_templatized($text) if defined $text;
        $obj->build_dynamic(0);
        foreach my $v (keys %$val) {
            $obj->column($v, $val->{$v}) if $obj->has_column($v);
        }
        $obj->blog_id($blog->id);
        if (my $pub_opts = $val->{publishing}) {
            $obj->include_with_ssi(1) if $pub_opts->{include_with_ssi};
        }
        if ( ( 'widgetset' eq $val->{type} )
          && ( exists $val->{widgets} ) ) {
            my $modulesets = delete $val->{widgets};
            $obj->modulesets( MT::Template->widgets_to_modulesets($modulesets, $blog->id) );
        }
        $obj->save;
        if ($val->{mappings}) {
            push @arch_tmpl, {
                template => $obj,
                mappings => $val->{mappings},
                exists($val->{preferred}) ? (preferred => $val->{preferred}) : ()
            };
        }
    }

    my %archive_types;
    if (@arch_tmpl) {
        require MT::TemplateMap;
        for my $map_set (@arch_tmpl) {
            my $tmpl = $map_set->{template};
            my $mappings = $map_set->{mappings};
            foreach my $map_key (keys %$mappings) {
                my $m = $mappings->{$map_key};
                my $at = $m->{archive_type};
                $archive_types{$at} = 1;
                # my $preferred = $mappings->{$map_key}{preferred};
                my $map = MT::TemplateMap->new;
                $map->archive_type($at);
                if ( exists $m->{preferred} ) {
                    $map->is_preferred($m->{preferred});
                }
                else {
                    $map->is_preferred(1);
                }
                $map->template_id($tmpl->id);
                $map->file_template($m->{file_template}) if $m->{file_template};
                $map->blog_id($tmpl->blog_id);
                $map->build_type( $m->{build_type} ) if defined $m->{build_type};
                $map->save;
            }
        }
    }

    $blog->archive_type( join ',', keys %archive_types );
    foreach my $at ( qw( Individual Daily Weekly Monthly Category ) ) {
        $blog->archive_type_preferred($at), last
            if exists $archive_types{$at};
    }
    $blog->custom_dynamic_templates('none');
    $blog->save;

    MT->run_callbacks(
        ref($blog). '::post_create_default_templates',
        $blog, 
        $tmpl_list
    );

    $app->set_language($curr_lang);
    return $blog;
}

# As of MT 4, we always manage fileinfo records.
sub needs_fileinfo {
    return 1;
}

sub current_timestamp {
    my $blog = shift;
    require MT::Util;
    my @ts = MT::Util::offset_time_list(time, $blog->id);
    return sprintf '%04d%02d%02d%02d%02d%02d',
        $ts[5]+1900, $ts[4]+1, @ts[3,2,1,0];
}

sub website {
    my $blog = shift;
    return $blog unless $blog->is_blog;
    return undef unless $blog->parent_id;

    require MT::Website;
    return MT::Website->load($blog->parent_id);
}

sub theme {
    require MT::Theme;
    my $blog = shift;
    my $id = $blog->theme_id;
    return MT::Theme->load($id);
}

sub raw_site_url {
    my $blog = shift;
    my $site_url = $blog->SUPER::site_url || '';
    if ( my ( $subdomain, $path ) = split( '/::/', $site_url ) ) {
        if ( $subdomain ne $site_url ) {
            return ( $subdomain, $path );
        }
    }
    return $site_url;
}

sub site_url {
    my $blog = shift;

    if (@_) {
        return $blog->SUPER::site_url(@_);
    } elsif ( $blog->is_dynamic ) {
        my $cfg = MT->config;
        my $path = $cfg->CGIPath;
        if ($path =~ m!^/!) {
            # relative path, prepend blog domain
            my ($blog_domain) = $blog->archive_url =~ m|(.+://[^/]+)|;
            $path = $blog_domain . $path;
        }
        $path .= '/' unless $path =~ m{/$};
        return $path;
    } else {
        my $url = '';
        if ($blog->is_blog()) {
            if (my $website = $blog->website()) {
                $url = $website->SUPER::site_url;
            }
            else {
                # FIXME: there are a few occasions where
                # a blog does not have its parent, like (bugid:102749)
                return $blog->SUPER::site_url;
            }
            my @paths = $blog->raw_site_url;
            if ( 2 == @paths ) {
                if ( $paths[0] ) {
                    $url =~ s!^(https?)://(.+)/$!$1://$paths[0]$2/!;
                }
                if ( $paths[1] ) {
                    $url = MT::Util::caturl( $url, $paths[1] );
                }
            }
            else {
                $url = MT::Util::caturl( $url, $paths[0] );
            }
        }
        else {
            $url = $blog->SUPER::site_url;
        }

        return $url;
    }
}

sub is_site_path_absolute {
    my $blog = shift;

    my $raw_path;
    if ( ref $blog ) {
        $raw_path = $blog->SUPER::site_path;
    }
    else {
        $raw_path = $_[0];
    }

    return 1 if $raw_path =~ m!^/!;
    return 1 if $raw_path =~ m!^[a-zA-Z]:\\!;
    return 1 if $raw_path =~ m!^\\\\[a-zA-Z0-9\.]+!; # UNC
    return 0;
}

sub site_path {
    my $blog = shift;

    if (@_) {
        $blog->SUPER::site_path(@_);
    } else {
        my $raw_path = $blog->SUPER::site_path;
        return $raw_path if $blog->is_site_path_absolute;

        my $base_path = '';
        my $path = '';
        my $website = $blog->website();
        if ($blog->is_blog() && $website) {
            $base_path = $website->column('site_path');
            if ( $base_path ) {
                $path = File::Spec->catdir( $base_path, $raw_path );
            } else {
                $path = $raw_path;
            }
        } else {
            $path = $raw_path;
        }
        return $path;
    }
}

sub raw_archive_url {
    my $blog = shift;
    my $archive_url = $blog->SUPER::archive_url;
    if ( my ( $subdomain, $path ) = split( '/::/', $archive_url ) ) {
        return ( $subdomain, $path );
        if ( $subdomain ne $archive_url ) {
            return ( $subdomain, $path );
        }
    }
    return $archive_url;
}

sub archive_url {
    my $blog = shift;

    if (@_) {
        $blog->SUPER::archive_url(@_) || $blog->site_url;
    }
    elsif ($blog->is_dynamic) {
        return $blog->site_url;
    }
    else {
        my $url = $blog->site_url;
        if ($blog->is_blog()) {
            if (my $website = $blog->website()) {
                $url = $website->SUPER::site_url;
            }
            my $archive_url = $blog->SUPER::archive_url;
            return $blog->site_url unless $archive_url;
            return $archive_url if $archive_url =~ m!^https?://!;
            my @paths = $blog->raw_archive_url;
            if ( 2 == @paths  ) {
                if ( $paths[0] ) {
                    $url =~ s!^(https?)://(.+)/$!$1://$paths[0]$2/!;
                }
                if ( $paths[1] ) {
                    $url = MT::Util::caturl( $url, $paths[1] );
                }
            }
            else {
                $url = MT::Util::caturl( $url, $paths[0] );
            }
        }
        return $url;
    }
}

sub is_archive_path_absolute {
    my $blog = shift;

    my $raw_path = $blog->SUPER::archive_path;
    return 0 unless $raw_path;
    return 1 if $raw_path =~ m!^/!;
    return 1 if $raw_path =~ m!^[a-zA-Z]:\\!;
    return 1 if $raw_path =~ m!^\\\\[a-zA-Z0-9\.]+!; # UNC
    return 0;
}

sub archive_path {
    my $blog = shift;

    if (@_) {
        $blog->SUPER::archive_path(@_) || $blog->site_path;
    } else {
        return $blog->site_path if !$blog->column('archive_path');

        my $raw_path = $blog->SUPER::archive_path;
        return $raw_path if $blog->is_archive_path_absolute;

        my $base_path = '';
        my $path = '';
        if (my $website = $blog->website()) {
            $base_path = $website->SUPER::site_path;
        }
        $path = $raw_path;
        if ( $base_path ) {
            $path = File::Spec->catdir( $base_path, $raw_path );
        } else {
            $path = $blog->site_path;
        }
        return $path;
    }
}

sub comment_text_filters {
    my $blog = shift;
    my $filters = $blog->convert_paras_comments;
    return [] unless $filters;
    if ($filters eq '1') {
        return [ '__default__' ];
    } else {
        return [ split /\s*,\s*/, $filters ];
    }
}

sub cc_license_url {
    my $cc = $_[0]->cc_license or return '';
    MT::Util::cc_url($cc);
}

sub email_all_comments {
    return $_[0]->email_new_comments == 1;
}

sub email_attn_reqd_comments {
    return $_[0]->email_new_comments == 2;
}

sub email_all_pings {
    return $_[0]->email_new_pings == 1;
}

sub email_attn_reqd_pings {
    return $_[0]->email_new_pings == 2;
}

sub MODERATE_NONE ()    { 0 }
sub MODERATE_ALL ()     { 1 }
sub MODERATE_UNTRSTD () { 2 }
sub MODERATE_UNAUTHD () { 3 }

sub publish_trusted_commenters {
    !($_[0]->moderate_unreg_comments == MODERATE_ALL);
}

sub publish_authd_untrusted_commenters {
    return $_[0]->moderate_unreg_comments == MODERATE_UNAUTHD
        || $_[0]->moderate_unreg_comments == MODERATE_NONE;
}

sub publish_unauthd_commenters {
    $_[0]->moderate_unreg_comments == MODERATE_NONE;
}

sub include_path_parts {
    my $blog = shift;
    my ($param) = @_;

    my $filestem = MT::Util::dirify($param->{name}) || 'template_'.$param->{id};
    my $filename = join q{.}, $filestem, $blog->file_extension;
    my $path = $param->{path} || '';
    my @path;
    if ($path =~ s!^/!!) {
        # absolute
        @path = split q{/}, $path;
    } else {
        # relative
        push @path, MT->config('IncludesDir');
        push @path, split q{/}, $path;
    }
    return ($filename, @path);
}

sub include_path {
    my $blog = shift;

    my ($filename, @path) = $blog->include_path_parts(@_);
    my $extra_path = File::Spec->catdir(@path);
    my $full_path = File::Spec->catdir($blog->site_path, $extra_path);
    my $file_path = File::Spec->catfile($full_path, $filename);
    return wantarray ? ($file_path, $full_path, $filename) : $file_path;
}

sub include_url {
    my $blog = shift;

    my ($filename, @path) = $blog->include_path_parts(@_);
    my $url = join q{/}, $blog->site_url, @path, $filename;
    return $url;
}

sub include_statement {
    my $blog = shift;

    my $system = $blog->include_system or return;

    my ($statement, $include);
    if ($system eq 'shtml') {
        $statement = q{<!--#include virtual="%s" -->};

        my ($filename, @path) = $blog->include_path_parts(@_);
        my $site_url = $blog->site_url;
        $site_url =~ s{ \A \w+ :// [^/]+ }{}xms;
        $site_url =~ s{ / \z }{}xms;
        $include = join q{/}, $site_url, @path, $filename;
    }
    else {
        $include = $blog->include_path(@_);
        $statement = $system eq 'php'   ? q{<?php include("%s") ?>}
                   : $system eq 'jsp'   ? q{<%@ include file="%s" %>}
                   : $system eq 'asp'   ? '<!--#include file="%s" -->'
                   :                      return
                   ;
    }
    return sprintf $statement, MT::Util::encode_php($include, q{qq});
}

sub file_mgr {
    my $blog = shift;
    unless (exists $blog->{__file_mgr}) {
## xxx need to add remote_host, remote_user, remote_pwd fields
## then pull params from there; if remote_host is defined, we
## assume we are using FTP?
        $blog->{__file_mgr} = MT::FileMgr->new('Local');
    }
    $blog->{__file_mgr};
}

sub remove {
    my $blog = shift;
    my $blog_id = $blog->id
        if ref( $blog );

    $blog->remove_children({ key => 'blog_id'});
    my $res = $blog->SUPER::remove(@_);
    if ($blog_id && $res) {
        require MT::Permission;
        MT::Permission->remove({ blog_id => $blog_id });
        require MT::PluginData;
        MT::PluginData->remove( { blog_id => $blog_id } );
    }
    $res;
}

# deprecated: use $blog->remote_auth_token instead
sub effective_remote_auth_token {
    my $blog = shift;
    if (scalar @_) {
        return $blog->remote_auth_token(@_);
    }
    if ($blog->remote_auth_token()) {
        return $blog->remote_auth_token();
    }
    undef;
}

sub has_archive_type {
    my $blog = shift;
    my ($type) = @_;
    my %at = map { lc $_ => 1 } split(/,/, $blog->archive_type);
    return 0 unless exists $at{lc $type};

    my $result = 0;
    require MT::TemplateMap;
    my @maps = MT::TemplateMap->load({blog_id => $blog->id,
                                      archive_type => $type});
    return 0 unless @maps;
    require MT::PublishOption;
    foreach my $map (@maps) {  
        $result++ if $map->build_type != MT::PublishOption::DISABLED();
    }
    return $result;
}

sub accepts_registered_comments {
    $_[0]->allow_reg_comments && $_[0]->commenter_authenticators;
}

sub accepts_comments {
    $_[0]->accepts_registered_comments || $_[0]->allow_unreg_comments;
}

sub count_static_templates {
    my $blog = shift;
    my ($archive_type) = @_;
    my $result = 0;
    require MT::TemplateMap;
    my @maps = MT::TemplateMap->load({blog_id => $blog->id,
                                      archive_type => $archive_type});
    return 0 unless @maps;
    require MT::PublishOption;
    foreach my $map (@maps) {  
        $result++ if $map->build_type != MT::PublishOption::DYNAMIC();
    }
    #$result ||= 1 if ($blog->custom_dynamic_templates || '') ne 'custom';
    return $result;
}

sub touch {
    my $blog = shift;
    my ( @types ) = @_;
    my ($s,$m,$h,$d,$mo,$y) = localtime(time);
    my $mod_time = sprintf("%04d%02d%02d%02d%02d%02d",
                           1900+$y, $mo+1, $d, $h, $m, $s);
    require MT::Touch;
    MT::Touch->touch( $blog->id, @types );
    $blog->children_modified_on($mod_time);
    $mod_time;
}

sub clone {
    my $blog = shift;
    my ($param) = @_;
    if ($param && $param->{Children}) {
        $blog->clone_with_children(@_);
    } else {
        $blog->SUPER::clone(@_);
    }
}

sub clone_with_children {
    my $blog = shift;
    my ($params) = @_;
    my $callback = $params->{Callback} || sub {};
    my $classes = $params->{Classes};
    my $blog_name = $params->{BlogName};
    my $website_id = $params->{Website};
    delete $$params{Children} if ($params->{Children});
    my $old_blog_id = $blog->id;

    # we must clone:
    #    Blog record
    #    Entry records
    #       - Comment records
    #       - TrackBack records
    #       - TBPing records
    #       - ObjectTag records (if running 3.3)
    #    Category records
    #    Placement records
    #    Template records
    #    Permission records
    #    IPBanList records???
    #    Notification records???

    my $new_blog_id;
    my ( %entry_map, %cat_map, %tb_map, %tmpl_map, %comment_map, $counter, $iter );

    # Cloning blog
    my $new_blog = $blog->clone($params);
    $new_blog->name($blog_name ? $blog_name : MT->translate("Clone of [_1]", $blog->name));
    $new_blog->parent_id($website_id);
    delete $new_blog->{column_values}->{id};
    delete $new_blog->{changed_cols}->{id};
    $new_blog->modified_on(undef);
    $new_blog->created_on(undef);
    $new_blog->save or die $new_blog->errstr;
    $new_blog_id = $new_blog->id;
    $callback->(MT->translate("Cloned blog... new id is [_1].",
        $new_blog_id));

    if ((!exists $classes->{'MT::Permission'}) || $classes->{'MT::Permission'}) {
        # Cloning PERMISSIONS records
        $counter = 0;
        my $state = MT->translate("Cloning permissions for blog:");
        $callback->($state, "perms");
        require MT::Permission;
        $iter = MT::Permission->load_iter({blog_id => $old_blog_id});

        while (my $perm = $iter->()) {
            $callback->($state . " " . MT->translate("[_1] records processed...", $counter), 'perms')
                if $counter && ($counter % 100 == 0);
            $counter++;
            my $new_perm = $perm->clone();
            delete $new_perm->{column_values}->{id};
            delete $new_perm->{changed_cols}->{id};
            $new_perm->blog_id($new_blog_id);
            $new_perm->save or die $new_perm->errstr;
        }
        $callback->($state . " " . MT->translate("[_1] records processed.", $counter), 'perms');
    }

    if ((!exists $classes->{'MT::Association'}) || $classes->{'MT::Association'}) {
        # Cloning association records
        $counter = 0;
        my $state = MT->translate("Cloning associations for blog:");
        $callback->($state, "assoc");
        require MT::Association;
        $iter = MT::Association->load_iter({blog_id => $old_blog_id});
        while (my $assoc = $iter->()) {
            $callback->($state . " " . MT->translate("[_1] records processed...", $counter), 'assoc')
                if $counter && ($counter % 100 == 0);
            $counter++;
            my $new_assoc = $assoc->clone();
            delete $new_assoc->{column_values}->{id};
            delete $new_assoc->{changed_cols}->{id};
            $new_assoc->blog_id($new_blog_id);
            $new_assoc->save or die $new_assoc->errstr;
        }
        $callback->($state . " " . MT->translate("[_1] records processed.", $counter), 'assoc');
    }

    # include/exclude class logic
    # if user has not specified 'Classes' element, clone everything
    # if user has specified Classes, but a particular class is not
    # identified, clone it (forward compatibility). if a class is
    # specified and the flag is '1', clone it. if a class is specified
    # but the flag is '0', skip it.

    # MT::Entry -> MT::Category, MT::Comment, MT::Tracback, MT::TBPing
    # MT::Page -> MT::Folder, MT::Comment, MT::Trackback, MT::TBPing

    if ((!exists $classes->{'MT::Entry'}) || $classes->{'MT::Entry'}) {
        # Cloning ENTRY records
        my $state = MT->translate("Cloning entries and pages for blog...");
        $callback->($state, "entries");
        $counter = 0;
        require MT::Entry;
        $iter = MT::Entry->load_iter({blog_id => $old_blog_id, class => '*'});
        while (my $entry = $iter->()) {
            $callback->($state . " " . MT->translate("[_1] records processed...", $counter), 'entries')
                if $counter && ($counter % 100 == 0);
            $counter++;
            my $entry_id = $entry->id;
            my $new_entry = $entry->clone();
            delete $new_entry->{column_values}->{id};
            delete $new_entry->{changed_cols}->{id};
            $new_entry->blog_id($new_blog_id);
            $new_entry->save or die $new_entry->errstr;
            $entry_map{$entry_id} = $new_entry->id;
        }
        $callback->($state . " " . MT->translate("[_1] records processed.", $counter), 'entries');

        if ((!exists $classes->{'MT::Category'}) || $classes->{'MT::Category'}) {
            # Cloning CATEGORY records
            my $state = MT->translate("Cloning categories for blog...");
            $callback->($state, "cats");
            $counter = 0;
            require MT::Category;
            $iter = MT::Category->load_iter({ blog_id => $old_blog_id, class => '*' });
            my %cat_parents;
            while (my $cat = $iter->()) {
                $callback->($state . " " . MT->translate("[_1] records processed...", $counter), 'cats')
                    if $counter && ($counter % 100 == 0);
                $counter++;
                my $cat_id = $cat->id;
                my $old_parent = $cat->parent;
                my $new_cat = $cat->clone();
                delete $new_cat->{column_values}->{id};
                delete $new_cat->{changed_cols}->{id};
                $new_cat->blog_id($new_blog_id);
                # temporarily wipe the parent association
                # to avoid constraint issues.
                $new_cat->parent(0);
                $new_cat->save or die $new_cat->errstr;
                $cat_map{$cat_id} = $new_cat->id;
                if ($old_parent) {
                    $cat_parents{$new_cat->id} = $old_parent;
                }
            }
            # reassign the new category parents
            foreach (keys %cat_parents) {
                my $cat = MT::Category->load($_);
                if ($cat) {
                    $cat->parent($cat_map{$cat_parents{$cat->id}});
                    $cat->save or die $cat->errstr;
                }
            }
            $callback->($state . " " . MT->translate("[_1] records processed.", $counter), 'cats');

            # Placements are automatically cloned if categories are
            # cloned.
            $state = MT->translate("Cloning entry placements for blog...");
            $callback->($state, "places");
            require MT::Placement;
            $iter = MT::Placement->load_iter({ blog_id => $old_blog_id });
            $counter = 0;
            while (my $place = $iter->()) {
                $callback->($state . " " . MT->translate("[_1] records processed...", $counter), 'places')
                    if $counter && ($counter % 100 == 0);
                $counter++;
                my $new_place = $place->clone();
                delete $new_place->{column_values}->{id};
                delete $new_place->{changed_cols}->{id};
                $new_place->blog_id($new_blog_id);
                $new_place->category_id($cat_map{$place->category_id});
                $new_place->entry_id($entry_map{$place->entry_id});
                $new_place->save or die $new_place->errstr;
            }
            $callback->($state . " " . MT->translate("[_1] records processed.", $counter), 'places');
        }

        if ((!exists $classes->{'MT::Comment'}) || $classes->{'MT::Comment'}) {
            # Comments can only be cloned if entries are cloned.
            my $state = MT->translate("Cloning comments for blog...");
            $callback->($state, "comments");
            require MT::Comment;
            $iter = MT::Comment->load_iter({ blog_id => $old_blog_id });
            $counter = 0;
            my %comment_parents;
            while (my $comment = $iter->()) {
                $callback->($state . " " . MT->translate("[_1] records processed...", $counter), 'comments')
                    if $counter && ($counter % 100 == 0);
                $counter++;

                my $new_comment = $comment->clone();
                delete $new_comment->{column_values}->{id};
                delete $new_comment->{changed_cols}->{id};
                $new_comment->entry_id( $entry_map{ $comment->entry_id } );
                $new_comment->blog_id($new_blog_id);
                $new_comment->save or die $new_comment->errstr;
                $comment_map{ $comment->id } = $new_comment->id;
                if ( $comment->parent_id ) {
                    $comment_parents{ $new_comment->id }
                        = $comment->parent_id;
                }
            }
            foreach ( keys %comment_parents ) {
                my $comment = MT::Comment->load($_);
                if ($comment) {
                    $comment->parent_id(
                        $comment_map{ $comment_parents{ $comment->id } } );
                    $comment->save or die $comment->errstr;
                }
            }
            $callback->($state . " " . MT->translate("[_1] records processed.", $counter), 'comments');
        }

        if ((!exists $classes->{'MT::ObjectTag'}) || $classes->{'MT::ObjectTag'}) {
            # conditionally do MT::ObjectTag since it is only
            # available with MT 3.3.
            if ($MT::VERSION >= 3.3) {
                my $state = MT->translate("Cloning entry tags for blog...");
                $callback->($state, "tags");
                require MT::ObjectTag;
                $iter = MT::ObjectTag->load_iter({ blog_id => $old_blog_id, object_datasource => 'entry' });
                $counter = 0;
                while (my $entry_tag = $iter->()) {
                    $callback->($state . " " . MT->translate("[_1] records processed...", $counter), "tags")
                        if $counter && ($counter % 100 == 0);
                    $counter++;
                    my $new_entry_tag = $entry_tag->clone();
                    delete $new_entry_tag->{column_values}->{id};
                    delete $new_entry_tag->{changed_cols}->{id};
                    $new_entry_tag->blog_id($new_blog_id);
                    $new_entry_tag->object_id($entry_map{$entry_tag->object_id});
                    $new_entry_tag->save or die $new_entry_tag->errstr;
                }
                $callback->($state . " " . MT->translate("[_1] records processed.", $counter), 'tags');
            }
        }
    } 
    elsif ((!exists $classes->{'MT::Category'}) || $classes->{'MT::Category'}) {
        # Cloning CATEGORY records
        my $state = MT->translate("Cloning categories for blog...");
        $callback->($state, "cats");
        $counter = 0;
        require MT::Category;
        $iter = MT::Category->load_iter({ blog_id => $old_blog_id, class => '*' });
        my %cat_parents;
        while (my $cat = $iter->()) {
            $callback->($state . " " . MT->translate("[_1] records processed...", $counter), 'cats')
                if $counter && ($counter % 100 == 0);
            $counter++;
            my $cat_id = $cat->id;
            my $old_parent = $cat->parent;
            my $new_cat = $cat->clone();
            delete $new_cat->{column_values}->{id};
            delete $new_cat->{changed_cols}->{id};
            $new_cat->blog_id($new_blog_id);
            # temporarily wipe the parent association
            # to avoid constraint issues.
            $new_cat->parent(0);
            $new_cat->save or die $new_cat->errstr;
            $cat_map{$cat_id} = $new_cat->id;
            if ($old_parent) {
                $cat_parents{$new_cat->id} = $old_parent;
            }
        }
        # reassign the new category parents
        foreach (keys %cat_parents) {
            my $cat = MT::Category->load($_);
            if ($cat) {
                $cat->parent($cat_map{$cat_parents{$cat->id}});
                $cat->save or die $cat->errstr;
            }
        }
        $callback->($state . " " . MT->translate("[_1] records processed.", $counter), 'cats');
    }

    if ((!exists $classes->{'MT::Trackback'}) || $classes->{'MT::Trackback'}) {
        my $state = MT->translate("Cloning TrackBacks for blog...");
        $callback->($state, "tbs");
        require MT::Trackback;
        $iter = MT::Trackback->load_iter({ blog_id => $old_blog_id });
        $counter = 0;
        while (my $tb = $iter->()) {
            next unless ($tb->entry_id && $entry_map{$tb->entry_id}) ||
                ($tb->category_id && $cat_map{$tb->category_id});

            $callback->($state . " " . MT->translate("[_1] records processed...", $counter), 'tbs')
                if $counter && ($counter % 100 == 0);
            $counter++;
            my $tb_id = $tb->id;
            my $new_tb = $tb->clone();
            delete $new_tb->{column_values}->{id};
            delete $new_tb->{changed_cols}->{id};

            if ($tb->category_id) {
                if (my $cid = $cat_map{$tb->category_id}) {
                    my $cat_tb = MT::Trackback->load(
                        { category_id => $cid }
                    );
                    if ($cat_tb) {
                        my $changed;
                        if ($tb->passphrase) {
                            $cat_tb->passphrase($tb->passphrase);
                            $changed = 1;
                        }
                        if ($tb->is_disabled) {
                            $cat_tb->is_disabled(1);
                            $changed = 1;
                        }
                        $cat_tb->save if $changed;
                        $tb_map{$tb_id} = $cat_tb->id;
                        next;
                    }
                }
            }
            elsif ($tb->entry_id) {
                if (my $eid = $entry_map{$tb->entry_id}) {
                    my $entry_tb = MT::Entry->load($eid)->trackback;
                    if ($entry_tb) {
                        my $changed;
                        if ($tb->passphrase) {
                            $entry_tb->passphrase($tb->passphrase);
                            $changed = 1;
                        }
                        if ($tb->is_disabled) {
                            $entry_tb->is_disabled(1);
                            $changed = 1;
                        }
                        $entry_tb->save if $changed;
                        $tb_map{$tb_id} = $entry_tb->id;
                        next;
                    }
                }
            }

            # A trackback wasn't created when saving the entry/category,
            # (perhaps trackbacks are now disabled for the entry/category?)
            # so create one now
            $new_tb->entry_id($entry_map{$tb->entry_id})
                if $tb->entry_id && $entry_map{$tb->entry_id};
            $new_tb->category_id($cat_map{$tb->category_id})
                if $tb->category_id && $cat_map{$tb->category_id};
            $new_tb->blog_id($new_blog_id);
            $new_tb->save or die $new_tb->errstr;
            $tb_map{$tb_id} = $new_tb->id;
        }
        $callback->($state . " " . MT->translate("[_1] records processed.", $counter), 'tbs');

        if ((!exists $classes->{'MT::TBPing'}) || $classes->{'MT::TBPing'}) {
            my $state = MT->translate("Cloning TrackBack pings for blog...");
            $callback->($state, "pings");
            require MT::TBPing;
            $iter = MT::TBPing->load_iter({ blog_id => $old_blog_id });
            $counter = 0;
            while (my $ping = $iter->()) {
                next unless $tb_map{$ping->tb_id};
                $callback->($state . " " . MT->translate("[_1] records processed...", $counter), 'pings')
                    if $counter && ($counter % 100 == 0);
                $counter++;
                my $new_ping = $ping->clone();
                delete $new_ping->{column_values}->{id};
                delete $new_ping->{changed_cols}->{id};
                $new_ping->tb_id($tb_map{$ping->tb_id});
                $new_ping->blog_id($new_blog_id);
                $new_ping->save or die $new_ping->errstr;
            }
            $callback->($state . " " . MT->translate("[_1] records processed.", $counter), 'pings');
        }
    }

    if ((!exists $classes->{'MT::Template'}) || $classes->{'MT::Template'}) {
        my $state = MT->translate("Cloning templates for blog...");
        $callback->($state, "tmpls");
        require MT::Template;
        $iter = MT::Template->load_iter(
            { blog_id => $old_blog_id, type => { not => 'widgetset' } }
        );
        my $tmpl_processor = sub {
            my ( $new_blog_id, $counter, $tmpl, $new_tmpl, $tmpl_map ) = @_;
            $callback->($state . " " . MT->translate("[_1] records processed...", $$counter), 'tmpls')
                if $counter && ($$counter % 100 == 0);
            my $tmpl_id = $tmpl->id;
            $$counter++;
            delete $new_tmpl->{column_values}->{id};
            delete $new_tmpl->{changed_cols}->{id};
            # linked_file won't be cloned for now because
            # new blog does not have site_path - breaks relative path
            delete $new_tmpl->{column_values}->{linked_file};
            delete $new_tmpl->{column_values}->{linked_file_mtime};
            delete $new_tmpl->{column_values}->{linked_file_size};
            $new_tmpl->blog_id($new_blog_id);
            $new_tmpl->save or die $new_tmpl->errstr;
            $tmpl_map->{$tmpl_id} = $new_tmpl->id;
        };
        $counter = 0;
        while (my $tmpl = $iter->()) {
            my $new_tmpl = $tmpl->clone();
            $tmpl_processor->($new_blog_id, \$counter, $tmpl, $new_tmpl, \%tmpl_map);
        }
        $iter = MT::Template->load_iter(
            { blog_id => $old_blog_id, type => 'widgetset' }
        );
        while (my $tmpl = $iter->()) {
            my @old_widgets = split /,/, $tmpl->modulesets;
            my $new_tmpl = $tmpl->clone();
            $tmpl_processor->($new_blog_id, \$counter, $tmpl, $new_tmpl, \%tmpl_map);
            my @new_widgets;
            foreach ( @old_widgets ) {
                if ( exists $tmpl_map{$_} ) {
                    push @new_widgets, $tmpl_map{$_};
                }
                else {
                    my $global_widget = MT::Template->load( $_ );
                    push @new_widgets, $_
                      if $global_widget
                      && $global_widget->blog_id == 0
                      && $global_widget->type eq 'widget'
                }
            }
            $new_tmpl->modulesets( join(',', @new_widgets) );
            $new_tmpl->save;
        }
        $callback->($state . " " . MT->translate("[_1] records processed.", $counter), 'tmpls');

        $state = MT->translate("Cloning template maps for blog...");
        $callback->($state, "tmplmaps");
        require MT::TemplateMap;
        $iter = MT::TemplateMap->load_iter({ blog_id => $old_blog_id });
        $counter = 0;
        while (my $map = $iter->()) {
            $callback->($state . " " . MT->translate("[_1] records processed...", $counter), 'tmplmaps')
                if $counter && ($counter % 100 == 0);
            $counter++;
            my $new_map = $map->clone();
            delete $new_map->{column_values}->{id};
            delete $new_map->{changed_cols}->{id};
            $new_map->template_id($tmpl_map{$map->template_id});
            $new_map->blog_id($new_blog_id);
            $new_map->save or die $new_map->errstr;
        }
        $callback->($state . " " . MT->translate("[_1] records processed.", $counter), 'tmplmaps');
    }

    MT->run_callbacks(ref($blog). '::post_clone',
        OldBlogId => $blog->id, old_blog_id => $blog->id,
        NewBlogId => $new_blog->id, new_blog_id => $new_blog->id,
        OldObject => $blog, old_object => $blog,
        NewObject => $new_blog, new_object => $new_blog,
        EntryMap => \%entry_map, entry_map => \%entry_map,
        CategoryMap => \%cat_map, category_map => \%cat_map,
        TrackbackMap => \%tb_map, trackback_map => \%tb_map,
        TemplateMap => \%tmpl_map, template_map => \%tmpl_map,
        Callback => $callback, callback => $callback,
    );
    $new_blog;
}

sub smart_replace {
    my $blog = shift;
    if (@_) {
        $blog->nwc_smart_replace(@_);
        return;
    }
    my $val = $blog->nwc_smart_replace;
    return defined($val) ? $val : MT->config->NwcSmartReplace;
}

sub smart_replace_fields {
    my $blog = shift;
    if (@_) {
        $blog->nwc_replace_field(@_);
        return;
    }
    my $val = $blog->nwc_replace_field;
    return defined($val) ? $val : MT->config->NwcReplaceField;
}

#trans('blog')
#trans('blogs')

sub apply_theme {
    my $blog = shift;
    my ($theme_id) = @_;
    require MT::Theme;
    $theme_id ||= $blog->theme_id;
    $theme_id ||= $blog->is_blog ? MT->config->DefaultBlogTheme : MT->config->DefaultWebsiteTheme;
    my $theme = MT::Theme->load($theme_id);
    if ( !defined $theme ) {
        return $blog->error(
            MT->translate(
                "Failed to load theme [_1]: [_2]", $theme_id, MT::Theme->errstr
            )
        );
    }
    $theme->apply($blog)
        or return $blog->error(
            MT->translate(
                "Failed to apply theme [_1]: [_2]", $theme_id, MT::Theme->errstr
            )
        );
    return 1;
}

sub use_revision {
    my $blog = shift;
    return unless ref($blog);
    return $blog->SUPER::use_revision( @_ )
        if 0 < scalar( @_ );
    return 0 unless MT->config->TrackRevisions;
    return $blog->SUPER::use_revision;
}

sub template_set {
    my $blog = shift;
    if (@_ ) {
        return $blog->SUPER::template_set( @_ );
    }

    my $theme = $blog->theme;
    unless ( $theme ) {
        # Try to load template set as theme.
        require MT::Theme;
        $theme = MT::Theme->load($blog->SUPER::template_set);
    }

    if ( $theme ) {
        my @elements = $theme->elements;
        my ( $elem ) = grep { $_->{importer} eq 'template_set' } @elements;
        if ( $elem ) {
            my $set = $elem->{data};
            $set->{envelope} = $theme->path
                if ref $set;
            return $set;
        }
    }

    $blog->SUPER::template_set;
}

sub to_hash {
    my $obj = shift;
    my $hash = $obj->SUPER::to_hash( @_ );
    $hash->{'blog.site_url'} = $obj->site_url;
    $hash->{'blog.archive_url'} = $obj->archive_url
        if exists( $hash->{'blog.archive_url'} );
    return $hash;
}

1;
__END__

=head1 NAME

MT::Blog - Movable Type blog record

=head1 SYNOPSIS

    use MT::Blog;
    my $blog = MT::Blog->load($blog_id);
    $blog->name('Some new name');
    $blog->save
        or die $blog->errstr;

=head1 DESCRIPTION

An I<MT::Blog> object represents a blog in the Movable Type system. It
contains all of the settings, preferences, and configuration for a particular
blog. It does not contain any per-author permissions settings--for those,
look at the I<MT::Permission> object.

=head1 USAGE

As a subclass of I<MT::Object>, I<MT::Blog> inherits all of the
data-management and -storage methods from that class; thus you should look
at the I<MT::Object> documentation for details about creating a new object,
loading an existing object, saving an object, etc.

The following methods are unique to the I<MT::Blog> interface:

=head2 $blog->file_mgr

Returns the I<MT::FileMgr> object specific to this particular blog.

=head1 DATA ACCESS METHODS

The I<MT::Blog> object holds the following pieces of data. These fields can
be accessed and set using the standard data access methods described in the
I<MT::Object> documentation.

=over 4

=item * id

The numeric ID of the blog.

=item * name

The name of the blog.

=item * description

The blog description.

=item * site_path

The path to the directory containing the blog's output index templates.

=item * site_url

The URL corresponding to the I<site_path>.

=item * archive_path

The path to the directory where the blog's archives are stored.

=item * archive_url

The URL corresponding to the I<archive_path>.

=item * server_offset

A slight misnomer, this is actually the timezone that the B<user> has
selected; the value is the offset from GMT.

=item * archive_type

A comma-separated list of archive types used in this particular blog, where
an archive type is one of the following: C<Individual>, C<Daily>, C<Weekly>,
C<Monthly>, or C<Category>. For example, a blog's I<archive_type> would be
C<Individual,Monthly> if the blog were using C<Individual> and C<Monthly>
archives.

=item * archive_type_preferred

The "preferred" archive type, which is used when constructing a link to the
archive page for a particular archive--if multiple archive types are selected,
for example, the link can only point to one of those archives. The preferred
archive type (which should be one of the archive types set in I<archive_type>,
above) specifies to which archive this link should point (among other things).

=item * days_on_index

The number of days to be displayed on the index.

=item * file_extension

The file extension to be used for archive pages.

=item * email_new_comments

A boolean flag specifying whether authors should be notified of new comments
posted on entries they have written.

=item * allow_comment_html

A boolean flag specifying whether HTML should be allowed in comments. If it
is not allowed, it is automatically stripped before building the page (note
that the content stored in the database is B<not> stripped).

=item * autolink_urls

A boolean flag specifying whether URLs in comments should be turned into
links. Note that this setting is only taken into account if
I<allow_comment_html> is turned off.

=item * sort_order_posts

The default sort order for entries. Valid values are either C<ascend> or
C<descend>.

=item * sort_order_comments

The default sort order for comments. Valid values are either C<ascend> or
C<descend>.

=item * allow_comments_default

The default value for the I<allow_comments> field in the I<MT::Entry> object.

=item * convert_paras

A comma-separated list of text filters to apply to each entry when it
is built.

=item * convert_paras_comments

A comma-separated list of text filters to apply to each comment when it
is built.

=item * status_default

The default value for the I<status> field in the I<MT::Entry> object.

=item * allow_anon_comments 

A boolean flag specifying whether anonymous comments (those posted without
a name or an email address) are allowed.

=item * allow_unreg_comments

A boolean flag specifying whether unregistered comments (those posted
without a validated email/password pair) are allowed.

=item * words_in_excerpt

The number of words in an auto-generated excerpt.

=item * ping_weblogs

A boolean flag specifying whether the system should send an XML-RPC ping to
I<weblogs.com> after an entry is saved.

=item * mt_update_key

The Movable Type Recently Updated Key to be sent to I<movabletype.org> after
an entry is saved.

=item * language

The language for date and time display for this particular blog.

=item * welcome_msg

The welcome message to be displayed on the main Editing Menu for this blog.
Should contain all desired HTML formatting.

=item * use_revision

Returns 0 if TrackRevisions master switch in mt-config is off.
Otherwise it returns the value stored in the column.

=back

=head1 METHODS

=over 4

=item * clone( [ \%parameters ] )

MT::Blog provides a clone method that supports cloning of all known child
records related to the MT::Blog object. To invoke this behavior, you
simply specify a parameter hash with a 'Children' key set.

    # Clones blog and all data related to this blog within the database.
    my $new_blog = $original_blog->clone({ Children => 1 });

You may further specify what kind of records are cloned in the process
of cloning child objects. Use the 'Classes' parameter to specifically
exclude particular classes:

    # Clones everything except comments and trackback pings
    my $new_blog = $original_blog->clone({
        Children => 1,
        Classes => { 'MT::Comments' => 0, 'MT::TBPing' => 0 }
    });

Note: Certain exclusions will prevent the clone process from including
other classes. For instance, if you exclude MT::Trackback, all MT::TBPing
objects are automatically excluded.

=item * apply_theme

TODO

=back

=head1 DATA LOOKUP

In addition to numeric ID lookup, you can look up or sort records by any
combination of the following fields. See the I<load> documentation in
I<MT::Object> for more information.

=over 4

=item * name

=back

=head1 NOTES

=over 4

=item *

When you remove a blog using I<MT::Blog::remove>, in addition to removing the
blog record, all of the entries, notifications, permissions, comments,
templates, and categories in that blog will also be removed.

=item *

Because the system needs to load I<MT::Blog> objects from disk relatively
often during the duration of one request, I<MT::Blog> objects are cached by
the I<MT::Blog::load> object so that each blog only need be loaded once. The
I<MT::Blog> objects are cached in the I<MT::Request> singleton object; note
that this caching B<only occurs> if the blogs are loaded by numeric ID.

=back

=head1 AUTHOR & COPYRIGHTS

Please see the I<MT> manpage for author, copyright, and license information.

=cut
